ROSAT all-sky survey on the Einstein EMSS sample

Details ROSAT all-sky survey on the Einstein EMSS sample ROSAT all-sky survey on the Einstein EMSS sample

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sao..reptr....m&link_type=abstract

Final Report, 1 Oct. 1990 - 30 Sep. 1992 Smithsonian Institution, Cambridge, MA. Astrophysical Observatory.

Astronomy and Astrophysics

Astrophysics

Active Galactic Nuclei, Red Shift, Rosat Mission, Stellar Evolution, Stellar Luminosity, X Ray Analysis, All Sky Photography, Astrophysics, Cosmology, Heao 2, Hubble Constant

Scientific paper

The cosmological evolution and the luminosity function (XLF) of X ray selected Active Galactic Nuclei (AGN's) are discussed. The sample used is extracted from the Einstein Observatory Extended Medium Sensitivity Surveys (EMSS) and consists of more than 420 objects. Preliminary results from the ROSAT All-Sky Survey data confirm the correctness of the optical identification of the EMSS sources, thus giving confidence to the results obtained from the analysis of the AGN's sample. The XLF observed at different redshifts (up to z approx. 2) gives direct evidence of cosmological evolution. Data have been analyzed within the framework of luminosity evolution models and the two most common evolutionary forms, Lx(Z) = Lx(0) x eCr and Lx(Z) = Lx(0) x (1 + z)C, have been considered. Luminosity dependent evolution is required if the evolution function has the exponential form, whereas the simpler pure luminosity evolution model is still acceptable if the evolution function has the power law form. Using the whole sample of objects the number-counts and the de-evolved (z = 0) XLF have been derived. A comparison of the EMSS data with preliminary ROSAT results presented at this meeting indicates an overall agreement.

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